The high spin states of a neutron-rich ^107 Tc nucleus are reinvestigated by observing prompt γ-rays from the spontaneous fission of ^252 Cf. The previous level scheme is updated. A collective band based on the π5/...The high spin states of a neutron-rich ^107 Tc nucleus are reinvestigated by observing prompt γ-rays from the spontaneous fission of ^252 Cf. The previous level scheme is updated. A collective band based on the π5/2- [303] orbital is confirmed and extended. Inconsistencies in the configuration assignments for a type of positive parity bands of odd-A 105,107,109 Tc in the previous reports are clarified according to the g factor calculations. A new band based on the 1499.5 keV level in ^107Tc is proposed as a two-phonon γ-vibrational band.展开更多
Levels in the neutron-rich ^112Ru nucleus have been investigated by observing prompt gamma-rays from the spontaneous fission of ^252Cf with the Gammasphere detector array. The ground state band and the one-phonon γ-v...Levels in the neutron-rich ^112Ru nucleus have been investigated by observing prompt gamma-rays from the spontaneous fission of ^252Cf with the Gammasphere detector array. The ground state band and the one-phonon γ-vibrational band have been confirmed and extended with spin up to 16h and 15h, respectively. The other two side bands, one proposed as two-phonon γ-vibrational band and the other proposed as two-quasiparticle band, have been observed for the first time. The total-Routhian-surface calculations show that rotational 112 Ru nucleus has triaxial deformation with parameters β2 - 0.27 and γ= -29°. The observed band crossing in the yrast band is due to the alignment of a pair of h11/2 neutrons according to the cranked shell model calculations. The possible configuration for the quasiparticle band has also been discussed.展开更多
The high spin states of the neutron-rich 109Tc nucleus are reinvestigated by observing prompt γ-rays from the spontaneous fission of 252 Cf. The previously known yrast band based on the 7/2＋ state is updated. A side...The high spin states of the neutron-rich 109Tc nucleus are reinvestigated by observing prompt γ-rays from the spontaneous fission of 252 Cf. The previously known yrast band based on the 7/2＋ state is updated. A side band built on the 11/2＋ state is expanded and a new band based on the 15/2＋ state is identified. Band crossing in the yrast band occurs around fω≈ 0.36 MeV. This band crossing is associated with the alignment of two h11/2 neutrons according to the cranked shell model calculations. The band based on the 11/2＋ state is proposed as a candidate for the one-phonon γ-vibrational band, and the band built on the 15/2＋ state is proposed as a candidate for the two-phonon γ-vibrational band. Other characteristics for the observed bands are discussed.展开更多
Levels in the neutron-rich ^105Mo nucleus have been investigated by observing prompt γ-rays following the spontaneous fission fragments of^252 Cf with the Gammasphere detector array. The yrast band has been confirmed...Levels in the neutron-rich ^105Mo nucleus have been investigated by observing prompt γ-rays following the spontaneous fission fragments of^252 Cf with the Gammasphere detector array. The yrast band has been confirmed and updated. The other two collective bands with the band head levels at 870.5 and 1534.6 keV are newly observed, and they are suggested as the candidates for one-phonon K= 9/2 and two-phonon K = 13/2 double γ-vibrational bands, respectively. Systematic characteristics of these bands have been discussed.展开更多
High spin states in A～110 neutron-rich 106Mo, 110Ru and 112Ru nuclei have been reinvestigated by measuring the prompt γ-rays from the spontaneous fission of 252Cf. Two similar sets of bands are observed to high spin...High spin states in A～110 neutron-rich 106Mo, 110Ru and 112Ru nuclei have been reinvestigated by measuring the prompt γ-rays from the spontaneous fission of 252Cf. Two similar sets of bands are observed to high spins in each of three nuclei. Through analyzing of characters of the band structures, the chiral doublet bands are suggested in 106Mo, 110Ru and 112Ru.展开更多
High-spin states in neutron-rich 102Mo nucleus have been studied by measuring the prompt γ-rays in the spontaneous fission of 252Cf. The previous level scheme has been updated and some new levels and transitions are ...High-spin states in neutron-rich 102Mo nucleus have been studied by measuring the prompt γ-rays in the spontaneous fission of 252Cf. The previous level scheme has been updated and some new levels and transitions are identified. The one-phonon γ-band is expanded and a band head level of the two-phonon γ- band is proposed. The systematic characteristics of yrast bands, one-phonon γ-bands, two-phonon γ-bands and quasi-particle bands in 102Mo, 104Mo and 106Mo are discussed.展开更多
The high spin states in neutron-rich 104Nb have been investigated from study of prompt γ-rays in spontaneous fission of 252Cf with the Gammasphere detector array. A new rotational band has been identified for the fir...The high spin states in neutron-rich 104Nb have been investigated from study of prompt γ-rays in spontaneous fission of 252Cf with the Gammasphere detector array. A new rotational band has been identified for the first time. This band is proposed as a semi-decoupled band based on the configuration π5/2-[303]ν1/2-[541].展开更多
Levels in the neutron-rich 109Ru have been studied by observing the prompt γ-rays following the spontaneous fission fragments of 252Cf. The ground state band and the negative parity bands have been confirmed and exte...Levels in the neutron-rich 109Ru have been studied by observing the prompt γ-rays following the spontaneous fission fragments of 252Cf. The ground state band and the negative parity bands have been confirmed and extended. A positive parity band with the band head level at 332.5 keV is newly identified and suggested as a single-neutron excitation band built on the 7/2+[404] Nilsson orbital. Some structural characteristics of these bands are discussed.展开更多
The high spin states of the neutron-rich odd-odd 106Tc nucleus have been reinvestigated by observing prompt γ-rays from the spontaneous fission of 252Cf. A previously known collective band is confirmed and expanded, ...The high spin states of the neutron-rich odd-odd 106Tc nucleus have been reinvestigated by observing prompt γ-rays from the spontaneous fission of 252Cf. A previously known collective band is confirmed and expanded, and a new collective band is newly identified. Several levels in previous report in 106Tc are reexamined and they belong to the members of a band in 107Tc. The total Routhian surface (TRS) calculations show that the 106Tc has triaxial shape. The spins and parities as well as the configurations for these bands have been tentatively assigned according to the analysis of the angular momentum alignments.展开更多
基金Supported by National Natural Science Foundation of China under Grants No 10775078, the National Basic Research Program under Grand No 2007CB815005, the Special Program of Higher Education Science Foundation under Grant No 20070003149. The work at Vanderbilt University and Lawrence Berkeley National Laboratory was supported by U.S. Department of Energy under Grant Nos DE-FG05-88ER40407 and DE-AC03-76SF00098.
文摘The high spin states of a neutron-rich ^107 Tc nucleus are reinvestigated by observing prompt γ-rays from the spontaneous fission of ^252 Cf. The previous level scheme is updated. A collective band based on the π5/2- [303] orbital is confirmed and extended. Inconsistencies in the configuration assignments for a type of positive parity bands of odd-A 105,107,109 Tc in the previous reports are clarified according to the g factor calculations. A new band based on the 1499.5 keV level in ^107Tc is proposed as a two-phonon γ-vibrational band.
基金Supported by the National Natural Science Foundation of China under Grant No 10375032, the Major State Basic Research Development Programme of China under Grant No G2000077405, the Special Programme of Higher Education Science Foundation of China under Grant No 20030003090, and the U.S. Department of Energy （DE-FG05-88ER40407）.
文摘Levels in the neutron-rich ^112Ru nucleus have been investigated by observing prompt gamma-rays from the spontaneous fission of ^252Cf with the Gammasphere detector array. The ground state band and the one-phonon γ-vibrational band have been confirmed and extended with spin up to 16h and 15h, respectively. The other two side bands, one proposed as two-phonon γ-vibrational band and the other proposed as two-quasiparticle band, have been observed for the first time. The total-Routhian-surface calculations show that rotational 112 Ru nucleus has triaxial deformation with parameters β2 - 0.27 and γ= -29°. The observed band crossing in the yrast band is due to the alignment of a pair of h11/2 neutrons according to the cranked shell model calculations. The possible configuration for the quasiparticle band has also been discussed.
基金Supported by the National Natural Science Foundation of China under Grants Nos 10775078 and 10975082, the National Basic Research Program of China under Grand No 2007CB815005, the Special Program of Higher Education of China under Grant No 20070003149. The work at Vanderbilt University and Lawrence Berkeley National Laboratory was supported by U.S. Department of Energy under Grant Nos DE-FG05-88ER40407 and DE-AC03-76SF00098.
文摘The high spin states of the neutron-rich 109Tc nucleus are reinvestigated by observing prompt γ-rays from the spontaneous fission of 252 Cf. The previously known yrast band based on the 7/2＋ state is updated. A side band built on the 11/2＋ state is expanded and a new band based on the 15/2＋ state is identified. Band crossing in the yrast band occurs around fω≈ 0.36 MeV. This band crossing is associated with the alignment of two h11/2 neutrons according to the cranked shell model calculations. The band based on the 11/2＋ state is proposed as a candidate for the one-phonon γ-vibrational band, and the band built on the 15/2＋ state is proposed as a candidate for the two-phonon γ-vibrational band. Other characteristics for the observed bands are discussed.
基金Supported by the National Natural Science Foundation of China under Grant Nos 10575057 and 10375032, the Special Program of Higher Education Science Foundation under Grant No 200003090, the U. S. Department of Energy under Grant Nos DE-FG05- 88ER40407 and DE-AC03-76SF00098.
文摘Levels in the neutron-rich ^105Mo nucleus have been investigated by observing prompt γ-rays following the spontaneous fission fragments of^252 Cf with the Gammasphere detector array. The yrast band has been confirmed and updated. The other two collective bands with the band head levels at 870.5 and 1534.6 keV are newly observed, and they are suggested as the candidates for one-phonon K= 9/2 and two-phonon K = 13/2 double γ-vibrational bands, respectively. Systematic characteristics of these bands have been discussed.
基金Supported by National Natural Science Foundation of China (10575057, 10775078)Major State Basic Research Development Program (2007CB815005)+1 种基金Special Program of Higher Education Science Foundation (20070003149)U.S. Department of Energy (DE-FG05-88ER40407, DE-AC03-76SF00098)
文摘High spin states in A～110 neutron-rich 106Mo, 110Ru and 112Ru nuclei have been reinvestigated by measuring the prompt γ-rays from the spontaneous fission of 252Cf. Two similar sets of bands are observed to high spins in each of three nuclei. Through analyzing of characters of the band structures, the chiral doublet bands are suggested in 106Mo, 110Ru and 112Ru.
基金Supported by National Natural Science Foundation of China (10575057, 10775078)Major State Basic Research Development Program (2007CB815005)+1 种基金Special Program of Higher Education Science Foundation (20070003149)U.S. Department of Energy under Grant and Contract Nos. DE-FG05-88ER40407, DE-AC03-76SF00098
文摘High-spin states in neutron-rich 102Mo nucleus have been studied by measuring the prompt γ-rays in the spontaneous fission of 252Cf. The previous level scheme has been updated and some new levels and transitions are identified. The one-phonon γ-band is expanded and a band head level of the two-phonon γ- band is proposed. The systematic characteristics of yrast bands, one-phonon γ-bands, two-phonon γ-bands and quasi-particle bands in 102Mo, 104Mo and 106Mo are discussed.
基金Supported by National Natural Science Foundation of China (10575057, 10775078)Major State Basic Research Development Program (2007CB815005)+1 种基金Special Program of Higher Education Science Foundation (20070003149)U.S. Department of Energy (DE-FG05-88ER40407, DE-AC03-76SF00098)
文摘The high spin states in neutron-rich 104Nb have been investigated from study of prompt γ-rays in spontaneous fission of 252Cf with the Gammasphere detector array. A new rotational band has been identified for the first time. This band is proposed as a semi-decoupled band based on the configuration π5/2-[303]ν1/2-[541].
基金Supported by National Natural Science Foundation of China (10575057, 10775078)Major State Basic Research Development Program (2007CB815005)+1 种基金Doctoral Program Foundation of Institutions of Higher Education of China (20070003149)U. S. Department of Energy (DE-FG05-88ER40407, DE-AC03-76SF00098)
文摘Levels in the neutron-rich 109Ru have been studied by observing the prompt γ-rays following the spontaneous fission fragments of 252Cf. The ground state band and the negative parity bands have been confirmed and extended. A positive parity band with the band head level at 332.5 keV is newly identified and suggested as a single-neutron excitation band built on the 7/2+[404] Nilsson orbital. Some structural characteristics of these bands are discussed.
基金Supported by National Natural Science Foundation of China (10575057, 10775078)Major State Basic Research Development Program (2007CB815005)+1 种基金Special Program of Higher Education Science Foundation (20070003149)U. S. Department of Energy (DE-FG05-88ER40407, DE-AC03-76SF00098)
文摘The high spin states of the neutron-rich odd-odd 106Tc nucleus have been reinvestigated by observing prompt γ-rays from the spontaneous fission of 252Cf. A previously known collective band is confirmed and expanded, and a new collective band is newly identified. Several levels in previous report in 106Tc are reexamined and they belong to the members of a band in 107Tc. The total Routhian surface (TRS) calculations show that the 106Tc has triaxial shape. The spins and parities as well as the configurations for these bands have been tentatively assigned according to the analysis of the angular momentum alignments.
